Bug 478611 - [DataBinding] Create snippets for the SideEffect class

Change-Id: I5e677f6ff85fd35f0bb9e5da8436a7b7a3c4d75e
Signed-off-by: Simon Scholz <simon.scholz@vogella.com>

1 files changed, 87 insertions, 0 deletions

diff --git a/examples/org.eclipse.jface.examples.databinding/src/org/eclipse/jface/examples/databinding/snippets/SnippetSideEffectAggregateValidationStatus.java b/examples/org.eclipse.jface.examples.databinding/src/org/eclipse/jface/examples/databinding/snippets/SnippetSideEffectAggregateValidationStatus.java
new file mode 100644
index 00000000000..110e065f7e8
--- /dev/null
+++ b/examples/org.eclipse.jface.examples.databinding/src/org/eclipse/jface/examples/databinding/snippets/SnippetSideEffectAggregateValidationStatus.java
@@ -0,0 +1,87 @@
+/*******************************************************************************
+ * Copyright (c) 2016 vogella GmbH and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     Simon Scholz <simon.scholz@vogella.com> - initial API and implementation
+ ******************************************************************************/
+
+package org.eclipse.jface.examples.databinding.snippets;
+
+import org.eclipse.core.databinding.AggregateValidationStatus;
+import org.eclipse.core.databinding.DataBindingContext;
+import org.eclipse.core.databinding.UpdateValueStrategy;
+import org.eclipse.core.databinding.observable.Realm;
+import org.eclipse.core.databinding.observable.sideeffect.ISideEffect;
+import org.eclipse.core.databinding.observable.value.WritableValue;
+import org.eclipse.core.databinding.validation.IValidator;
+import org.eclipse.core.databinding.validation.ValidationStatus;
+import org.eclipse.core.runtime.Status;
+import org.eclipse.jface.databinding.swt.DisplayRealm;
+import org.eclipse.jface.databinding.swt.typed.WidgetProperties;
+import org.eclipse.jface.layout.GridDataFactory;
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.layout.GridLayout;
+import org.eclipse.swt.widgets.Button;
+import org.eclipse.swt.widgets.Display;
+import org.eclipse.swt.widgets.Label;
+import org.eclipse.swt.widgets.Shell;
+import org.eclipse.swt.widgets.Text;
+
+public class SnippetSideEffectAggregateValidationStatus {
+
+	public static void main(String[] args) {
+		final Display display = new Display();
+		Realm.runWithDefault(DisplayRealm.getRealm(display), () -> run(display));
+		display.dispose();
+	}
+
+	private static void run(final Display display) {
+		Shell shell = new Shell(display);
+		shell.setText("ISideEffect & AggregateValidationStatus");
+		shell.setLayout(new GridLayout(2, false));
+
+		new Label(shell, SWT.NONE).setText("Enter '5' to be valid:");
+
+		Text text = new Text(shell, SWT.BORDER);
+		WritableValue<String> value = new WritableValue<>();
+
+		Button okButton = new Button(shell, SWT.BORDER);
+		okButton.setText("Ok");
+		GridDataFactory.swtDefaults().hint(200, SWT.DEFAULT).applyTo(okButton);
+
+		DataBindingContext bindingContext = new DataBindingContext();
+
+		// Bind the text to the value
+		IValidator validator = textValue -> "5".equals(textValue) ? Status.OK_STATUS
+				: ValidationStatus.error("The value was '" + value + "', not '5'");
+		bindingContext.bindValue(WidgetProperties.text(SWT.Modify).observe(text), value,
+				new UpdateValueStrategy().setAfterConvertValidator(validator),
+				null);
+
+		// Track the max severity of all bindings
+		AggregateValidationStatus validationStatus = new AggregateValidationStatus(bindingContext.getBindings(),
+				AggregateValidationStatus.MAX_SEVERITY);
+
+		// Bind the button enabled state to the validation status
+		ISideEffect okButtonEnablement = ISideEffect.create(() -> validationStatus.getValue().isOK(),
+				okButton::setEnabled);
+
+		shell.addDisposeListener(e -> {
+			bindingContext.dispose();
+			okButtonEnablement.dispose();
+		});
+
+		shell.pack();
+		shell.open();
+
+		while (!shell.isDisposed()) {
+			if (!display.readAndDispatch()) {
+				display.sleep();
+			}
+		}
+	}
+}